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Finding the Third Proportional to 320.75 and 445.38

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Solution

The third proportional to 320.75 and 445.38 is: 618.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.75 : 445.38 = 445.38 : x
  2. Step 2: Convert to fraction form
    320.75/445.38 = 445.38/x
  3. Step 3: Cross multiply
    320.75x = 445.38 × 445.38
  4. Step 4: Simplify right side
    320.75x = 198,358.89
  5. Step 5: Solve for x
    x = 198,358.89/320.75
  6. Step 6: Final answer
    x = 618.42

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.